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Diffstat (limited to 'src/Rahm/Desktop/Layout.hs')
| -rw-r--r-- | src/Rahm/Desktop/Layout.hs | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/src/Rahm/Desktop/Layout.hs b/src/Rahm/Desktop/Layout.hs new file mode 100644 index 0000000..95854b8 --- /dev/null +++ b/src/Rahm/Desktop/Layout.hs @@ -0,0 +1,326 @@ +{-# LANGUAGE MultiParamTypeClasses, ViewPatterns, FlexibleInstances, KindSignatures, DataKinds, GADTs, RankNTypes, PolyKinds #-} +module Rahm.Desktop.Layout where + +import GHC.TypeLits + +import Data.Proxy (Proxy(..)) +import Rahm.Desktop.CornerLayout (Corner(..)) +import Control.Arrow (second) +import XMonad.Hooks.ManageDocks +import XMonad.Layout.Circle +import XMonad.Layout.Accordion +import Control.Applicative +import XMonad.Layout.Spacing +import Data.List +import XMonad.Layout.Spiral +import XMonad.Layout.ThreeColumns +import XMonad.Layout.Grid +import XMonad.Layout.Dishes +import XMonad.Layout.MosaicAlt +import XMonad.Layout.Fullscreen +import qualified XMonad.Layout.Dwindle as D +import XMonad.Layout +import XMonad.Layout.LayoutModifier +import XMonad +import XMonad.Core +import XMonad.Layout.NoBorders (smartBorders, noBorders) + +import Rahm.Desktop.LayoutList +import Rahm.Desktop.Windows + +import qualified Data.Map as M +import qualified XMonad.StackSet as W + +myLayout = + fullscreenFull $ + avoidStruts $ + spacingRaw True (Border 5 5 5 5) True (Border 5 5 5 5) True $ + layoutZipper $ + mods (reinterpretIncMaster $ spiral (6/7)) |: + mods (modifyMosaic (MosaicAlt M.empty :: MosaicAlt Window)) |: + mods (reinterpretIncMaster $ Corner (3/4) (3/100)) |: + mods (ModifyDescription TallDescriptionModifier (Tall 1 (3/100) (1/2))) |: + mods (ModifyDescription ThreeColDescMod (ThreeCol 1 (3/100) (1/2))) |: + mods Grid |: + mods (Dishes 2 (1/6)) |: + mods (reinterpretIncMaster $ D.Dwindle D.R D.CW 1.5 1.1) |: + nil + +-- This is a type class that defines how to reinterpret a message. One can think +-- of this as a kind of type-level function. It lets one associate a function +-- (reinterpretMessage) with a type construct, which for the case below is a +-- Symbol. +-- +-- It would be nice to attach this function to the LayoutModifier directly as a +-- value, however LayoutModifiers must be Show-able and Read-able and functions +-- are not. However encoding in the typesystem itsef which function is to be +-- called is the best alternative I have. +class DoReinterpret (k :: t) where + reinterpretMessage :: + Proxy k -> SomeMessage -> X (Maybe SomeMessage) + +-- Mosaic doesn't have the concept of a "Master Space", so reinterpret messages +-- intended to modify the master space and instead have those messages expand +-- and shrink the current window. +-- +-- "ForMosaic" is an instance of the Symbol kind. This is some neat type-system +-- hacking one can do in Haskell. +instance DoReinterpret "ForMosaic" where + + -- IncMaster message + reinterpretMessage _ (fromMessage -> Just (IncMasterN n)) = do + fmap (SomeMessage . + (if n > 0 + then expandWindowAlt + else shrinkWindowAlt)) <$> getFocusedWindow + + -- ResizeMaster message + reinterpretMessage _ (fromMessage -> Just m) = do + fmap (SomeMessage . + (case m of + Expand -> expandWindowAlt + Shrink -> shrinkWindowAlt)) <$> getFocusedWindow + + -- Messages that don't match the above, just leave it unmodified. + reinterpretMessage _ m = return (Just m) + +instance DoReinterpret "IncMasterToResizeMaster" where + reinterpretMessage _ (fromMessage -> Just (IncMasterN n)) = + return $ Just $ + if n > 0 + then SomeMessage Expand + else SomeMessage Shrink + reinterpretMessage _ m = return (Just m) + +-- Data construct for association a DoReinterpret function with a concrete +-- construct that can be used in the LayoutModifier instance. +-- +-- It wolud be nice to have ReinterpretMessage hold the function as a value +-- rather than delegate to this kind-instance, however, it won't work because +-- LayoutModifiers have to be Read-able and Show-able, and functions are neither +-- of those, so a value-level function may not be a member of a LayoutModifier, +-- thus I have to settle for delegating to a hard-coded instance using +-- type-classes. +data ReinterpretMessage k a = ReinterpretMessage + deriving (Show, Read) + +-- Instance for ReinterpretMessage as a Layout modifier. +instance (DoReinterpret k) => + LayoutModifier (ReinterpretMessage k) a where + + handleMessOrMaybeModifyIt self message = do + + -- Delegates to the reinterpretMessage function associatied with the + -- type-variable k. + newMessage <- reinterpretMessage (ofProxy self) message + case newMessage of + Just m -> return $ Just $ Right m + Nothing -> return $ Just $ Left self + where + -- ofProxy just provides reifies the phantom type k so the type system can + -- figure out what instance to go to. + ofProxy :: ReinterpretMessage k a -> Proxy k + ofProxy _ = Proxy + +modifyMosaic :: l a -> ModifiedLayout (ReinterpretMessage "ForMosaic") l a +modifyMosaic = ModifiedLayout ReinterpretMessage + +reinterpretIncMaster :: + l a -> ModifiedLayout (ReinterpretMessage "IncMasterToResizeMaster") l a +reinterpretIncMaster = ModifiedLayout ReinterpretMessage + +mods = + ModifiedLayout (Zoomable False 0.05 0.05) . + ModifiedLayout (Flippable False) . + ModifiedLayout (HFlippable False) . + ModifiedLayout (Rotateable False) + + +data ModifyDescription m l a = ModifyDescription m (l a) + deriving (Show, Read) + +data TallDescriptionModifier = TallDescriptionModifier + deriving (Show, Read) + +data ThreeColDescMod = ThreeColDescMod + deriving (Show, Read) + +class DescriptionModifier m l where + newDescription :: m -> l a -> String -> String + +instance (Typeable m, Show m, DescriptionModifier m l, LayoutClass l a) => LayoutClass (ModifyDescription m l) a where + runLayout (W.Workspace t (ModifyDescription m l) a) rect = do + (rects, maybeNewLayout) <- runLayout (W.Workspace t l a) rect + return (rects, fmap (ModifyDescription m) maybeNewLayout) + + doLayout (ModifyDescription m l) a s = do + (rects, maybeNewLayout) <- doLayout l a s + return (rects, fmap (ModifyDescription m) maybeNewLayout) + + pureLayout (ModifyDescription m l) a s = pureLayout l a s + + emptyLayout (ModifyDescription m l) a = do + (rects, maybeNewLayout) <- emptyLayout l a + return (rects, fmap (ModifyDescription m) maybeNewLayout) + + handleMessage (ModifyDescription m l) a = do + maybeNewLayout <- handleMessage l a + return (ModifyDescription m <$> maybeNewLayout) + + pureMessage (ModifyDescription m l) a = + let maybeNewLayout = pureMessage l a in + ModifyDescription m <$> maybeNewLayout + + description (ModifyDescription m l) = newDescription m l (description l) + +instance DescriptionModifier TallDescriptionModifier Tall where + newDescription _ (Tall mast _ _) _ = "Tall(" ++ show mast ++ ")" + +instance DescriptionModifier ThreeColDescMod ThreeCol where + newDescription _ (ThreeCol mast _ _) _ = "ThreeCol(" ++ show mast ++ ")" + newDescription _ (ThreeColMid mast _ _) _ = "ThreeColMid(" ++ show mast ++ ")" + +data ResizeZoom = ShrinkZoom | ExpandZoom deriving (Typeable) + +instance Message ResizeZoom where + +newtype Flippable a = Flippable Bool -- True if flipped + deriving (Show, Read) + +newtype HFlippable a = HFlippable Bool -- True if flipped + deriving (Show, Read) + +newtype Rotateable a = Rotateable Bool -- True if rotated + deriving (Show, Read) + +data FlipLayout = FlipLayout deriving (Typeable) + +data HFlipLayout = HFlipLayout deriving (Typeable) + +data DoRotate = DoRotate deriving (Typeable) + +data Zoomable a = Zoomable Bool Float Float -- True if zooming in on the focused window. + deriving (Show, Read) + +-- Toggles if the current window should be zoomed or not. Set the boolean +-- to set the zoom.mhar +data ZoomModifier = + ToggleZoom | + Zoom | + Unzoom + deriving (Typeable) + +instance Message FlipLayout where + +instance Message HFlipLayout where + +instance Message ZoomModifier where + +instance Message DoRotate where + +instance (Eq a) => LayoutModifier Rotateable a where + pureModifier (Rotateable rotate) (Rectangle x' y' sw sh) _ returned = + if rotate + then (map (second (unzero . scaleRect . mirrorRect . zero)) returned, Nothing) + else (returned, Nothing) + where + zero (Rectangle x y w h) = Rectangle (x - x') (y - y') w h + unzero (Rectangle x y w h) = Rectangle (x + x') (y + y') w h + + scaleRect (Rectangle x y w h) = + Rectangle (x * fi sw `div` fi sh) + (y * fi sh `div` fi sw) + (w * sw `div` sh) + (h * sh `div` sw) + + fi = fromIntegral + + + pureMess (Rotateable rot) mess = + fmap (\DoRotate -> Rotateable (not rot)) (fromMessage mess) + + modifyDescription (Rotateable rot) underlying = + let descr = description underlying in + if rot + then descr ++ " Rotated" + else descr + +instance (Eq a) => LayoutModifier Flippable a where + pureModifier (Flippable flip) (Rectangle sx _ sw _) stack returned = + if flip + then (map (second doFlip) returned, Nothing) + else (returned, Nothing) + where + doFlip (Rectangle x y w h) = + Rectangle ((sx + fromIntegral sw) - x - fromIntegral w + sx) y w h + + pureMess (Flippable flip) message = + case fromMessage message of + Just FlipLayout -> Just (Flippable (not flip)) + Nothing -> Nothing + + modifyDescription (Flippable flipped) underlying = + let descr = description underlying in + if flipped + then descr ++ " Flipped" + else descr + +instance (Eq a) => LayoutModifier HFlippable a where + pureModifier (HFlippable flip) (Rectangle _ sy _ sh) stack returned = + if flip + then (map (second doFlip) returned, Nothing) + else (returned, Nothing) + where + doFlip (Rectangle x y w h) = + Rectangle x ((sy + fromIntegral sh) - y - fromIntegral h + sy) w h + + pureMess (HFlippable flip) message = + case fromMessage message of + Just HFlipLayout -> Just (HFlippable (not flip)) + Nothing -> Nothing + + modifyDescription (HFlippable flipped) underlying = + let descr = description underlying in + if flipped + then descr ++ " HFlipped" + else descr + + +instance (Eq a) => LayoutModifier Zoomable a where + redoLayout (Zoomable doit ws hs) (Rectangle x y w h) stack returned = + if doit + then + let focused = W.focus <$> stack + (zoomed, rest) = partition ((==focused) . Just . fst) returned + in case zoomed of + [] -> return (rest, Nothing) + ((fwin, _):_) -> return ((fwin, Rectangle (x + wp) (y + hp) (w - fromIntegral (wp * 2)) (h - fromIntegral (hp * 2))) : rest, Nothing) + + else return (returned, Nothing) + where + wp = floor $ fromIntegral w * ws + hp = floor $ fromIntegral h * hs + + handleMessOrMaybeModifyIt self@(Zoomable showing sw sh) mess = + return $ + (handleResize <$> fromMessage mess) + <|> (Left . handleZoom <$> fromMessage mess) + where + handleResize r = + if showing + then Left $ Zoomable showing (guard $ sw + d) (guard $ sh + d) + else Right $ case r of + ShrinkZoom -> SomeMessage Shrink + ExpandZoom -> SomeMessage Expand + + where d = (case r of + ShrinkZoom -> -1 + ExpandZoom -> 1) * 0.02 + + handleZoom ToggleZoom = Zoomable (not showing) sw sh + handleZoom Zoom = Zoomable True sw sh + handleZoom Unzoom = Zoomable False sw sh + + guard f | f > 1 = 1 + | f < 0 = 0 + | otherwise = f |